Hi You should do what is indicated in the note: h1->Sumw2(); h1-Scale(...); h1->Fit(...); Rene Brun On Sun, 21 Sep 2003, [gb2312] Dong Zhou wrote: > dear ROOTers: > > in the html document, i find that > > IMPORTANT NOTE: If you intend to use the errors of this histogram later, you should call Sumw2 before making this operation. > This is particularly important if you fit the histogram after TH1::Scale > > now, i have to scale the histogram before fit it to a function, what shouldl i do? just call Sumw2( ) before Fit( )? > like h1->Scale(....); > h1->Sumw2( ); > h1->Fit(.....); > ? > > Thank u for ur help. > > Zhou, Dong > > > > > --------------------------------- > Do You Yahoo!? > 启用电邮帐号，领会雅虎通[身临其境聊电影]的动感魅力，还有网络摄像头+雅虎通收音机等你来拿
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